BYO NTP GNSS Timing Performance

GNSS Timing Performance

ms = millisecond = 1e-3 = 0.001

µs = microsecond = 1e-6 = 0.000001

ns = nanosecond = 1e-9 = 0.000000001

ps = picosecond = 1e-12 = 0.000000000001

Hover over a cell to preview a graph of GNSS accuracy.

This table shows the timing performance of various GNSS receivers on varying hardware, operating systems, and NTP daemons. Numeric values are the most inaccurate reading measured during a 12 hour measuring interval. The 3 left header columns are links to the build recipe for that row. Selecting the numeric values will open an image of the GNSS performance graph for that row.

HW	OS	daemon	M10	LEA-M8T	MAX-M8Q	NEO-7M	VK-162 U7	6M
Pi 4	Pi OS	chrony		0.000000206	0.000002850	0.000000268	0.00101	0.000000222
Pi 4	Pi OS	sec		0.000004000	0.000005900	0.000003000	0.01540	0.000006000
Pi 4	Pi OS	sec + gpsd		0.000004000	0.000005000	0.000002700	0.00621	0.000004100
Pi 4	Pi OS	ntp		0.000005000	0.000003000	0.000004000	0.00602	0.000031000
Pi 4	BSD	chrony		0.000000315	0.000001910	0.000000541	0.00194	0.000000522
Pi 4	BSD	sec	0.000014000	0.000007000	0.000011000	0.000015000	0.00278	0.000011000
Pi 4	BSD	ntp	0.000025000	0.000004000	0.000011000	0.000016000	0.00374	0.000012000
Pi 4	BSD	ntp + gpsd	0.000029000		0.000002320	0.000023000	0.00523	0.000022000

Pi 5	Pi OS	chrony		0.000000174	0.000000170		0.00127	0.000000313
Pi 5	Pi OS	sec		0.000003000	0.000002000		0.01020	0.000012000
Pi 5	Pi OS	ntp		0.000005000	0.000003000		0.00676	0.000005000
Pi 5	BSD	chrony		0.000003320	0.000001730	0.000002030	0.00266	0.000019500
Pi 5	BSD	sec		0.000071000	0.000039000	0.000028000	0.00598	0.000022000
Pi 5	BSD	sec + gpsd		0.000066000	0.000017000	0.000015000	0.00578	0.000015000
Pi 5	BSD	ntp		0.000070000	0.000032000	0.000037000	0.00551	0.000025000

LarkBox	BSD	chrony		0.000002440	0.000001910	0.000004930	0.00688	0.000004500
LarkBox	BSD	sec		0.000058000	0.000045000	0.000088000	0.01500	0.024900000
LarkBox	BSD	sec + gpsd		0.000045000	0.000017000	0.000072000	0.01020	0.000025000
LarkBox	BSD	ntp		0.000053000	0.000061000	0.000051000	0.00919	0.021700000
LarkBox	BSD	ntp + gpsd		0.000056000	0.000057000	0.000143000	0.00673
LarkBox	Win	ntp					0.01360

Xeon E5	BSD	chrony			0.000000426
Xeon E5	BSD	sec			0.000002000
Xeon E5	BSD	ntp			0.000004000
Xeon E5	Linux	chrony			0.000008810

M3 MBA	Mac	chrony				0.001580000		0.00172
M3 MBA	Mac	mac-pps		0.000372		0.000358000
M3 MBA	Mac	sec				0.008000000
M3 MBA	Mac	sec + gpsd				0.007890000

daemon

M10

LEA-M8T

MAX-M8Q

NEO-7M

VK-162
U7

Pi 4

Pi OS

chrony

0.000000206

0.000002850

0.000000268

0.00101

0.000000222

Pi 4

Pi OS

sec

0.000004000

0.000005900

0.000003000

0.01540

0.000006000

Pi 4

Pi OS

sec + gpsd

0.000004000

0.000005000

0.000002700

0.00621

0.000004100

Pi 4

Pi OS

ntp

0.000005000

0.000003000

0.000004000

0.00602

0.000031000

Pi 4

BSD

chrony

0.000000315

0.000001910

0.000000541

0.00194

0.000000522

Pi 4

BSD

sec

0.000014000

0.000007000

0.000011000

0.000015000

0.00278

0.000011000

Pi 4

BSD

ntp

0.000025000

0.000004000

0.000011000

0.000016000

0.00374

0.000012000

Pi 4

BSD

ntp + gpsd

0.000029000

0.000002320

0.000023000

0.00523

0.000022000

Pi 5

Pi OS

chrony

0.000000174

0.000000170

0.00127

0.000000313

Pi 5

Pi OS

sec

0.000003000

0.000002000

0.01020

0.000012000

Pi 5

Pi OS

ntp

0.000005000

0.000003000

0.00676

0.000005000

Pi 5

BSD

chrony

0.000003320

0.000001730

0.000002030

0.00266

0.000019500

Pi 5

BSD

sec

0.000071000

0.000039000

0.000028000

0.00598

0.000022000

Pi 5

BSD

sec + gpsd

0.000066000

0.000017000

0.000015000

0.00578

0.000015000

Pi 5

BSD

ntp

0.000070000

0.000032000

0.000037000

0.00551

0.000025000

LarkBox

BSD

chrony

0.000002440

0.000001910

0.000004930

0.00688

0.000004500

LarkBox

BSD

sec

0.000058000

0.000045000

0.000088000

0.01500

0.024900000

LarkBox

BSD

sec + gpsd

0.000045000

0.000017000

0.000072000

0.01020

0.000025000

LarkBox

BSD

ntp

0.000053000

0.000061000

0.000051000

0.00919

0.021700000

LarkBox

BSD

ntp + gpsd

0.000056000

0.000057000

0.000143000

0.00673

LarkBox

Win

ntp

0.01360

Xeon E5

BSD

chrony

0.000000426

Xeon E5

BSD

sec

0.000002000

Xeon E5

BSD

ntp

0.000004000

Xeon E5

Linux

chrony

0.000008810

M3 MBA

Mac

chrony

0.001580000

0.00172

M3 MBA

Mac

mac-pps

0.000372

0.000358000

M3 MBA

Mac

sec

0.008000000

M3 MBA

Mac

sec + gpsd

0.007890000

BSD = FreeBSD 14

Linux = Debian 12 (Bookworm)

Pi OS = Raspberry Pi OS 12 Lite (Bookworm)

Mac = macOS 15 (Sequoia)

Win = Windows 11